30 PIN UNKNOWN CONNECTOR
| Pin | Name | Dir | Description | 
|---|---|---|---|
| 1 | n/c | Reserved for SCSI disk mode. | |
| 2 | /DB0 |  | Bit 0 of SCSI data bus | 
| 3 | GND |  | Ground | 
| 4 | /DB1 |  | Bit 1 of SCSI data bus | 
| 5 | TPWR |  | Termination power | 
| 6 | /DB2 |  | Bit 2 of SCSI data bus | 
| 7 | /DB3 |  | Bit 3 of SCSI data bus | 
| 8 | GND |  | Ground | 
| 9 | /ACKS |  | Handshake signal. When low acknowledges a request for data transfer | 
| 10 | GND |  | Ground | 
| 11 | /DB4 |  | Bit 4 of SCSI data bus | 
| 12 | GND |  | Ground | 
| 13 | GND |  | Ground | 
| 14 | /DB5 |  | Bit 5 of SCSI data bus | 
| 15 | GND |  | Ground | 
| 16 | /DB6 |  | Bit 6 of SCSI data bus | 
| 17 | GND |  | Ground | 
| 18 | /DB7 |  | Bit 7 of SCSI data bus | 
| 19 | /DBP |  | SCSI data bus parity bit | 
| 20 | GND |  | Ground | 
| 21 | /REQ |  | Request for a data transfer | 
| 22 | GND |  | Ground | 
| 23 | /BSY |  | When active (low) indicates that the SCSI data bus is busy | 
| 24 | GND |  | Ground | 
| 25 | /ATN |  | When active (low) indicates an attention condition | 
| 26 | /C/D |  | When active (low) indicates that data is on the SCSI bus. When high, indicates that control signals are on the bus | 
| 27 | /RST |  | SCSI bus reset | 
| 28 | /MSG |  | Indicates the message phase | 
| 29 | /SEL |  | SCSI select | 
| 30 | /I/O |  | Controls the direction of data output. When high, data is input | 
Note: Direction is Device relative Bus (other Devices).
| Contributor: | Joakim Ögren | 
| Source: | Apple Tech Info Library 12929: Duo Dock/Duo Dock II, External Pinouts at Apple TIL homepage | 
  Copyright © The Hardware Book Team 1996-2004.
  May be copied and redistributed, partially or in whole, as appropriate.
  Document last modified: 2002-01-10